Manual Pages for UNIX Darwin command on man tk

Manual Pages for UNIX Darwin command on man tk_textCut

text(n) Tk Built-In Commands text(n)

NAME

text, tktextCopy, tktextCut, tktextPaste - Create and manipulate

text widgets

SYNOPSIS

tteexxtt pathName ?options? ttkktteexxttCCooppyy pathName | ttkktteexxttCCuutt pathName | ttkktteexxttPPaassttee pathName | SSTTAANNDDAARRDD OOPPTTIIOONNSS

-bbaacckkggrroouunndd -hhiigghhlliigghhtttthhiicckknneessss -rreelliieeff

-bboorrddeerrwwiiddtthh -iinnsseerrttbbaacckkggrroouunndd -sseelleeccttbbaacckkggrroouunndd

-ccuurrssoorr -iinnsseerrttbboorrddeerrwwiiddtthh -sseelleeccttbboorrddeerrwwiiddtthh

-eexxppoorrttsseelleeccttiioonn -iinnsseerrttooffffttiimmee -sseelleeccttffoorreeggrroouunndd

-ffoonntt -iinnsseerrttoonnttiimmee -sseettggrriidd

-ffoorreeggrroouunndd -iinnsseerrttwwiiddtthh -ttaakkeeffooccuuss

-hhiigghhlliigghhttbbaacckkggrroouunndd -ppaaddxx -xxssccrroollllccoommmmaanndd

-hhiigghhlliigghhttccoolloorr -ppaaddyy -yyssccrroollllccoommmmaanndd

See the ooppttiioonnss manual entry for details on the standard options.

WWIIDDGGEETT-SSPPEECCIIFFIICC OOPPTTIIOONNSS

Command-Line Name:-aauuttoosseeppaarraattoorrss

Database Name: aauuttooSSeeppaarraattoorrss Database Class: AAuuttooSSeeppaarraattoorrss

Specifies a boolean that says whether separators are automati- |

cally inserted in the undo stack. Only meaningful when the -uunnddoo |

option is true.

Command-Line Name:-hheeiigghhtt

Database Name: hheeiigghhtt Database Class: HHeeiigghhtt

Specifies the desired height for the window, in units of charac-

ters in the font given by the -ffoonntt option. Must be at least

one.

Command-Line Name:-mmaaxxuunnddoo

Database Name: mmaaxxUUnnddoo Database Class: MMaaxxUUnnddoo Specifies the maximum number of compound undo actions on the | undo stack. A zero or a negative value imply an unlimited undo | stack.

Command-Line Name:-ssppaacciinngg11

Database Name: ssppaacciinngg11 Database Class: SSppaacciinngg11 Requests additional space above each text line in the widget, using any of the standard forms for screen distances. If a line

wraps, this option only applies to the first line on the dis-

play. This option may be overriden with -ssppaacciinngg11 options in

tags.

Command-Line Name:-ssppaacciinngg22

Database Name: ssppaacciinngg22 Database Class: SSppaacciinngg22 For lines that wrap (so that they cover more than one line on the display) this option specifies additional space to provide between the display lines that represent a single line of text.

The value may have any of the standard forms for screen dis-

tances. This option may be overriden with -ssppaacciinngg22 options in

tags.

Command-Line Name:-ssppaacciinngg33

Database Name: ssppaacciinngg33 Database Class: SSppaacciinngg33 Requests additional space below each text line in the widget, using any of the standard forms for screen distances. If a line wraps, this option only applies to the last line on the display.

This option may be overriden with -ssppaacciinngg33 options in tags.

Command-Line Name:-ssttaattee

Database Name: ssttaattee Database Class: SSttaattee Specifies one of two states for the text: nnoorrmmaall or ddiissaabblleedd. If the text is disabled then characters may not be inserted or deleted and no insertion cursor will be displayed, even if the input focus is in the widget.

Command-Line Name:-ttaabbss

Database Name: ttaabbss Database Class: TTaabbss Specifies a set of tab stops for the window. The option's value consists of a list of screen distances giving the positions of the tab stops. Each position may optionally be followed in the next list element by one of the keywords lleefftt, rriigghhtt, cceenntteerr, or nnuummeerriicc, which specifies how to justify text relative to the tab stop. LLeefftt is the default; it causes the text following the tab

character to be positioned with its left edge at the tab posi-

tion. RRiigghhtt means that the right edge of the text following the tab character is positioned at the tab position, and cceenntteerr means that the text is centered at the tab position. NNuummeerriicc means that the decimal point in the text is positioned at the

tab position; if there is no decimal point then the least sig-

nificant digit of the number is positioned just to the left of the tab position; if there is no number in the text then the

text is right-justified at the tab position. For example, -ttaabbss

{{22cc lleefftt 44cc 66cc cceenntteerr}} creates three tab stops at two-centimeter

intervals; the first two use left justification and the third uses center justification. If the list of tab stops does not have enough elements to cover all of the tabs in a text line,

then Tk extrapolates new tab stops using the spacing and align-

ment from the last tab stop in the list. The value of the ttaabbss

option may be overridden by -ttaabbss options in tags. If no -ttaabbss

option is specified, or if it is specified as an empty list, then Tk uses default tabs spaced every eight (average size) characters.

Command-Line Name:-uunnddoo

Database Name: uunnddoo Database Class: UUnnddoo Specifies a boolean that says whether the undo mechanism is | active or not.

Command-Line Name:-wwiiddtthh

Database Name: wwiiddtthh Database Class: WWiiddtthh

Specifies the desired width for the window in units of charac-

ters in the font given by the -ffoonntt option. If the font doesn't

have a uniform width then the width of the character ``0'' is used in translating from character units to screen units.

Command-Line Name:-wwrraapp

Database Name: wwrraapp Database Class: WWrraapp Specifies how to handle lines in the text that are too long to be displayed in a single line of the text's window. The value must be nnoonnee or cchhaarr or wwoorrdd. A wrap mode of nnoonnee means that each line of text appears as exactly one line on the screen; extra characters that don't fit on the screen are not displayed.

In the other modes each line of text will be broken up into sev-

eral screen lines if necessary to keep all the characters visi-

ble. In cchhaarr mode a screen line break may occur after any char-

acter; in wwoorrdd mode a line break will only be made at word boundaries.

DESCRIPTION

The tteexxtt command creates a new window (given by the pathName argument) and makes it into a text widget. Additional options, described above,

may be specified on the command line or in the option database to con-

figure aspects of the text such as its default background color and relief. The tteexxtt command returns the path name of the new window. A text widget displays one or more lines of text and allows that text to be edited. Text widgets support four different kinds of annotations on the text, called tags, marks, embedded windows or embedded images.

Tags allow different portions of the text to be displayed with differ-

ent fonts and colors. In addition, Tcl commands can be associated with

tags so that scripts are invoked when particular actions such as key-

strokes and mouse button presses occur in particular ranges of the text. See TAGS below for more details. The second form of annotation consists of marks, which are floating

markers in the text. Marks are used to keep track of various interest-

ing positions in the text as it is edited. See MARKS below for more details. The third form of annotation allows arbitrary windows to be embedded in a text widget. See EMBEDDED WINDOWS below for more details. The fourth form of annotation allows Tk images to be embedded in a text widget. See EMBEDDED IMAGES below for more details.

The text widget also has a built-in undo/redo mechanism. See UNDO |

MECHANISM below for more details. IINNDDIICCEESS

Many of the widget commands for texts take one or more indices as argu-

ments. An index is a string used to indicate a particular place within a text, such as a place to insert characters or one endpoint of a range of characters to delete. Indices have the syntax base modifier modifier modifier ... Where base gives a starting point and the modifiers adjust the index from the starting point (e.g. move forward or backward one character). Every index must contain a base, but the modifiers are optional. The base for an index must have one of the following forms:

line..char Indicates char'th character on line line. Lines are num-

bered from 1 for consistency with other UNIX programs that use this numbering scheme. Within a line, characters are

numbered from 0. If char is eenndd then it refers to the new-

line character that ends the line. @@x,,y Indicates the character that covers the pixel whose x and y coordinates within the text's window are x and y. eenndd Indicates the end of the text (the character just after the last newline). mark Indicates the character just after the mark whose name is mark. tag..ffiirrsstt Indicates the first character in the text that has been

tagged with tag. This form generates an error if no char-

acters are currently tagged with tag. tag..llaasstt Indicates the character just after the last one in the text that has been tagged with tag. This form generates an error if no characters are currently tagged with tag. pathName Indicates the position of the embedded window whose name is pathName. This form generates an error if there is no embedded window by the given name. imageName Indicates the position of the embedded image whose name is imageName. This form generates an error if there is no embedded image by the given name. If the base could match more than one of the above forms, such as a mark and imageName both having the same value, then the form earlier in the above list takes precedence. If modifiers follow the base index, each one of them must have one of the forms listed below. Keywords

such as cchhaarrss and wwoorrddeenndd may be abbreviated as long as the abbrevia-

tion is unambiguous. ++ count cchhaarrss Adjust the index forward by count characters, moving to later lines in the text if necessary. If there are fewer than count characters in the text after the current index, then set the index to the last character in the text. Spaces on either side of count are optional.

- count cchhaarrss

Adjust the index backward by count characters, moving to earlier lines in the text if necessary. If there are fewer than count characters in the text before the current index, then set the index to the first character in the text. Spaces on either side of count are optional. ++ count lliinneess Adjust the index forward by count lines, retaining the same character position within the line. If there are fewer than count lines after the line containing the current index, then set the index to refer to the same character position on the last line of the text. Then, if the line is not long enough to contain a character at the indicated character position, adjust the character position to refer to the last character of the line (the newline). Spaces on either side of count are optional.

- count lliinneess

Adjust the index backward by count lines, retaining the same character position within the line. If there are fewer than count lines before the line containing the current index, then set the index to refer to the same character position on the first line of the text. Then, if the line is not long enough to contain a character at the indicated character position, adjust the character position to refer to the last character of the line (the newline). Spaces on either side of count are optional. lliinneessttaarrtt Adjust the index to refer to the first character on the line. lliinneeeenndd Adjust the index to refer to the last character on the line (the newline). wwoorrddssttaarrtt Adjust the index to refer to the first character of the word containing the current index. A word consists of any number of adjacent characters that are letters, digits, or underscores, or a single character that is not one of these. wwoorrddeenndd Adjust the index to refer to the character just after the last one of the word containing the current index. If the current index refers to the last character of the text then it is not modified.

If more than one modifier is present then they are applied in left-to-

right order. For example, the index ``eenndd - 11 cchhaarrss'' refers to the

next-to-last character in the text and ``iinnsseerrtt wwoorrddssttaarrtt - 11 cc''

refers to the character just before the first one in the word contain-

ing the insertion cursor. TTAAGGSS

The first form of annotation in text widgets is a tag. A tag is a tex-

tual string that is associated with some of the characters in a text. Tags may contain arbitrary characters, but it is probably best to avoid

using the the characters `` '' (space), ++, or -: these characters have

special meaning in indices, so tags containing them can't be used as indices. There may be any number of tags associated with characters in

a text. Each tag may refer to a single character, a range of charac-

ters, or several ranges of characters. An individual character may have any number of tags associated with it. A priority order is defined among tags, and this order is used in

implementing some of the tag-related functions described below. When a

tag is defined (by associating it with characters or setting its dis-

play options or binding commands to it), it is given a priority higher than any existing tag. The priority order of tags may be redefined

using the ``pathName ttaagg rraaiissee'' and ``pathName ttaagg lloowweerr'' widget com-

mands. Tags serve three purposes in text widgets. First, they control the way information is displayed on the screen. By default, characters are displayed as determined by the bbaacckkggrroouunndd, ffoonntt, and ffoorreeggrroouunndd options for the text widget. However, display options may be associated with individual tags using the ``pathName ttaagg ccoonnffiigguurree'' widget command. If a character has been tagged, then the display options associated with the tag override the default display style. The following options are currently supported for tags:

-bbaacckkggrroouunndd color

Color specifies the background color to use for characters asso-

ciated with the tag. It may have any of the forms accepted by TTkkGGeettCCoolloorr.

-bbggssttiippppllee bitmap

Bitmap specifies a bitmap that is used as a stipple pattern for the background. It may have any of the forms accepted by TTkkGGeettBBiittmmaapp. If bitmap hasn't been specified, or if it is specified as an empty string, then a solid fill will be used for the background.

-bboorrddeerrwwiiddtthh pixels

Pixels specifies the width of a 3-D border to draw around the

background. It may have any of the forms accepted by TTkkGGeettPPiixx-

eellss. This option is used in conjunction with the -rreelliieeff option

to give a 3-D appearance to the background for characters; it is

ignored unless the -bbaacckkggrroouunndd option has been set for the tag.

-eelliiddee boolean

Elide specifies whether the data should be elided. Elided data is not displayed and takes no space on screen, but further on behaves just as normal data.

-ffggssttiippppllee bitmap

Bitmap specifies a bitmap that is used as a stipple pattern when

drawing text and other foreground information such as under-

lines. It may have any of the forms accepted by TTkkGGeettBBiittmmaapp. If bitmap hasn't been specified, or if it is specified as an empty string, then a solid fill will be used.

-ffoonntt fontName

FontName is the name of a font to use for drawing characters. It may have any of the forms accepted by TTkkGGeettFFoonntt.

-ffoorreeggrroouunndd color

Color specifies the color to use when drawing text and other foreground information such as underlines. It may have any of the forms accepted by TTkkGGeettCCoolloorr.

-jjuussttiiffyy justify

If the first character of a display line has a tag for which this option has been specified, then justify determines how to justify the line. It must be one of lleefftt, rriigghhtt, or cceenntteerr. If

a line wraps, then the justification for each line on the dis-

play is determined by the first character of that display line.

-llmmaarrggiinn11 pixels

If the first character of a text line has a tag for which this option has been specified, then pixels specifies how much the

line should be indented from the left edge of the window. Pix-

els may have any of the standard forms for screen distances. If a line of text wraps, this option only applies to the first line

on the display; the -llmmaarrggiinn22 option controls the indentation

for subsequent lines.

-llmmaarrggiinn22 pixels

If the first character of a display line has a tag for which this option has been specified, and if the display line is not the first for its text line (i.e., the text line has wrapped), then pixels specifies how much the line should be indented from

the left edge of the window. Pixels may have any of the stan-

dard forms for screen distances. This option is only used when wrapping is enabled, and it only applies to the second and later display lines for a text line.

-ooffffsseett pixels

Pixels specifies an amount by which the text's baseline should be offset vertically from the baseline of the overall line, in

pixels. For example, a positive offset can be used for super-

scripts and a negative offset can be used for subscripts. Pix-

els may have any of the standard forms for screen distances.

-oovveerrssttrriikkee boolean

Specifies whether or not to draw a horizontal rule through the middle of characters. Boolean may have any of the forms accepted by TTkkGGeettBBoooolleeaann.

-rreelliieeff relief

Relief specifies the 3-D relief to use for drawing backgrounds,

in any of the forms accepted by TTkkGGeettRReelliieeff. This option is

used in conjunction with the -bboorrddeerrwwiiddtthh option to give a 3-D

appearance to the background for characters; it is ignored

unless the -bbaacckkggrroouunndd option has been set for the tag.

-rrmmaarrggiinn pixels

If the first character of a display line has a tag for which this option has been specified, then pixels specifies how wide a margin to leave between the end of the line and the right edge of the window. Pixels may have any of the standard forms for screen distances. This option is only used when wrapping is enabled. If a text line wraps, the right margin for each line

on the display is determined by the first character of that dis-

play line.

-ssppaacciinngg11 pixels

Pixels specifies how much additional space should be left above

each text line, using any of the standard forms for screen dis-

tances. If a line wraps, this option only applies to the first line on the display.

-ssppaacciinngg22 pixels

For lines that wrap, this option specifies how much additional space to leave between the display lines for a single text line. Pixels may have any of the standard forms for screen distances.

-ssppaacciinngg33 pixels

Pixels specifies how much additional space should be left below

each text line, using any of the standard forms for screen dis-

tances. If a line wraps, this option only applies to the last line on the display.

-ttaabbss tabList

TabList specifies a set of tab stops in the same form as for the

-ttaabbss option for the text widget. This option only applies to a

display line if it applies to the first character on that dis-

play line. If this option is specified as an empty string, it cancels the option, leaving it unspecified for the tag (the

default). If the option is specified as a non-empty string that

is an empty list, such as -ttaaggss {{ }}, then it requests default

8-character tabs as described for the ttaaggss widget option.

-uunnddeerrlliinnee boolean

Boolean specifies whether or not to draw an underline underneath

characters. It may have any of the forms accepted by TTkkGGeett-

BBoooolleeaann.

-wwrraapp mode

Mode specifies how to handle lines that are wider than the

text's window. It has the same legal values as the -wwrraapp option

for the text widget: nnoonnee, cchhaarr, or wwoorrdd. If this tag option

is specified, it overrides the -wwrraapp option for the text widget.

If a character has several tags associated with it, and if their dis-

play options conflict, then the options of the highest priority tag are

used. If a particular display option hasn't been specified for a par-

ticular tag, or if it is specified as an empty string, then that option

will never be used; the next-highest-priority tag's option will used

instead. If no tag specifies a particular display option, then the default style for the widget will be used.

The second purpose for tags is event bindings. You can associate bind-

ings with a tag in much the same way you can associate bindings with a widget class: whenever particular X events occur on characters with the given tag, a given Tcl command will be executed. Tag bindings can be used to give behaviors to ranges of characters; among other things,

this allows hypertext-like features to be implemented. For details,

see the description of the ttaagg bbiinndd widget command below. The third use for tags is in managing the selection. See THE SELECTION below. MMAARRKKSS The second form of annotation in text widgets is a mark. Marks are used for remembering particular places in a text. They are something like tags, in that they have names and they refer to places in the file, but a mark isn't associated with particular characters. Instead,

a mark is associated with the gap between two characters. Only a sin-

gle position may be associated with a mark at any given time. If the characters around a mark are deleted the mark will still remain; it will just have new neighbor characters. In contrast, if the characters

containing a tag are deleted then the tag will no longer have an asso-

ciation with characters in the file. Marks may be manipulated with the ``pathName mmaarrkk'' widget command, and their current locations may be determined by using the mark name as an index in widget commands.

Each mark also has a gravity, which is either lleefftt or rriigghhtt. The grav-

ity for a mark specifies what happens to the mark when text is inserted at the point of the mark. If a mark has left gravity, then the mark is treated as if it were attached to the character on its left, so the mark will remain to the left of any text inserted at the mark position. If the mark has right gravity, new text inserted at the mark position

will appear to the left of the mark (so that the mark remains right-

most). The gravity for a mark defaults to rriigghhtt. The name space for marks is different from that for tags: the same

name may be used for both a mark and a tag, but they will refer to dif-

ferent things.

Two marks have special significance. First, the mark iinnsseerrtt is associ-

ated with the insertion cursor, as described under THE INSERTION CURSOR

below. Second, the mark ccuurrrreenntt is associated with the character clos-

est to the mouse and is adjusted automatically to track the mouse posi-

tion and any changes to the text in the widget (one exception: ccuurrrreenntt is not updated in response to mouse motions if a mouse button is down; the update will be deferred until all mouse buttons have been released). Neither of these special marks may be deleted. EEMMBBEEDDDDEEDD WWIINNDDOOWWSS The third form of annotation in text widgets is an embedded window. Each embedded window annotation causes a window to be displayed at a particular point in the text. There may be any number of embedded windows in a text widget, and any widget may be used as an embedded window (subject to the usual rules for geometry management, which require the text window to be the parent of the embedded window or a descendant of its parent). The embedded window's position on the screen will be updated as the text is modified or scrolled, and it will be mapped and unmapped as it moves into and out of the visible area of the text widget. Each embedded window occupies one character's worth of index space in the text widget, and it may be referred to either by the name of its embedded window or by its position in the widget's index space. If the range of text containing the embedded window is deleted then the window is destroyed.

When an embedded window is added to a text widget with the wwiinnddooww ccrree-

aattee widget command, several configuration options may be associated

with it. These options may be modified later with the wwiinnddooww ccoonnffiigg-

uurree widget command. The following options are currently supported:

-aalliiggnn where

If the window is not as tall as the line in which it is dis-

played, this option determines where the window is displayed in the line. Where must have one of the values ttoopp (align the top

of the window with the top of the line), cceenntteerr (center the win-

dow within the range of the line), bboottttoomm (align the bottom of the window with the bottom of the line's area), or bbaasseelliinnee (align the bottom of the window with the baseline of the line).

-ccrreeaattee script

Specifies a Tcl script that may be evaluated to create the win-

dow for the annotation. If no -wwiinnddooww option has been specified

for the annotation this script will be evaluated when the anno-

tation is about to be displayed on the screen. Script must cre-

ate a window for the annotation and return the name of that win-

dow as its result. If the annotation's window should ever be

deleted, script will be evaluated again the next time the anno-

tation is displayed.

-ppaaddxx pixels

Pixels specifies the amount of extra space to leave on each side of the embedded window. It may have any of the usual forms defined for a screen distance.

-ppaaddyy pixels

Pixels specifies the amount of extra space to leave on the top and on the bottom of the embedded window. It may have any of the usual forms defined for a screen distance.

-ssttrreettcchh boolean

If the requested height of the embedded window is less than the height of the line in which it is displayed, this option can be

used to specify whether the window should be stretched verti-

cally to fill its line. If the -ppaaddyy option has been specified

as well, then the requested padding will be retained even if the window is stretched.

-wwiinnddooww pathName

Specifies the name of a window to display in the annotation. EEMMBBEEDDDDEEDD IIMMAAGGEESS The final form of annotation in text widgets is an embedded image. Each embedded image annotation causes an image to be displayed at a particular point in the text. There may be any number of embedded

images in a text widget, and a particular image may be embedded in mul-

tiple places in the same text widget. The embedded image's position on the screen will be updated as the text is modified or scrolled. Each embedded image occupies one character's worth of index space in the text widget, and it may be referred to either by its position in the widget's index space, or the name it is assigned when the image is inserted into the text widget widh iimmaaggee ccrreeaattee. If the range of text containing the embedded image is deleted then that copy of the image is removed from the screen. When an embedded image is added to a text widget with the iimmaaggee ccrreeaattee widget command, a name unique to this instance of the image is returned. This name may then be used to refer to this image instance.

The name is taken to be the value of the -nnaammee option (described

below). If the -nnaammee option is not provided, the -iimmaaggee name is used

instead. If the imageName is already in use in the text widget, then

##nn is added to the end of the imageName, where nn is an arbitrary

integer. This insures the imageName is unique. Once this name is assigned to this instance of the image, it does not change, even though

the -iimmaaggee or -nnaammee values can be changed with iimmaaggee ccoonnffiigguurree.

When an embedded image is added to a text widget with the iimmaaggee ccrreeaattee widget command, several configuration options may be associated with

it. These options may be modified later with the iimmaaggee ccoonnffiigguurree wid-

get command. The following options are currently supported:

-aalliiggnn where

If the image is not as tall as the line in which it is dis-

played, this option determines where the image is displayed in the line. Where must have one of the values ttoopp (align the top of the image with the top of the line), cceenntteerr (center the image within the range of the line), bboottttoomm (align the bottom of the image with the bottom of the line's area), or bbaasseelliinnee (align the bottom of the image with the baseline of the line).

-iimmaaggee image

Specifies the name of the Tk image to display in the annotation. If image is not a valid Tk image, then an error is returned.

-nnaammee ImageName

Specifies the name by which this image instance may be refer-

enced in the text widget. If ImageName is not supplied, then the name of the Tk image is used instead. If the imageName is

already in use, #nn is appended to the end of the name as

described above.

-ppaaddxx pixels

Pixels specifies the amount of extra space to leave on each side of the embedded image. It may have any of the usual forms defined for a screen distance.

-ppaaddyy pixels

Pixels specifies the amount of extra space to leave on the top and on the bottom of the embedded image. It may have any of the usual forms defined for a screen distance. TTHHEE SSEELLEECCTTIIOONN Selection support is implemented via tags. If the eexxppoorrttSSeelleeccttiioonn option for the text widget is true then the sseell tag will be associated with the selection: [1] Whenever characters are tagged with sseell the text widget will claim ownership of the selection. [2] Attempts to retrieve the selection will be serviced by the text widget, returning all the characters with the sseell tag. [3] If the selection is claimed away by another application or by another window within this application, then the sseell tag will be removed from all characters in the text. [4] Whenever the sseell tag range changes a virtual event <<<>>> is generated. The sseell tag is automatically defined when a text widget is created, and it may not be deleted with the ``pathName ttaagg ddeelleettee'' widget command.

Furthermore, the sseelleeccttBBaacckkggrroouunndd, sseelleeccttBBoorrddeerrWWiiddtthh, and sseelleeccttFFoorree-

ggrroouunndd options for the text widget are tied to the -bbaacckkggrroouunndd, -bboorr-

ddeerrwwiiddtthh, and -ffoorreeggrroouunndd options for the sseell tag: changes in either

will automatically be reflected in the other. TTHHEE IINNSSEERRTTIIOONN CCUURRSSOORR The mark named iinnsseerrtt has special significance in text widgets. It is defined automatically when a text widget is created and it may not be unset with the ``pathName mmaarrkk uunnsseett'' widget command. The iinnsseerrtt mark

represents the position of the insertion cursor, and the insertion cur-

sor will automatically be drawn at this point whenever the text widget has the input focus. TTHHEE MMOODDIIFFIIEEDD FFLLAAGG The text widget can keep track of changes to the content of the widget by means of the modified flag. Inserting or deleting text will set this flag. The flag can be queried, set and cleared programatically as well.

Whenever the flag changes state a <<<>>> virtual event is gener-

ated. See the eeddiitt mmooddiiffiieedd widget command for more details. TTHHEE UUNNDDOO MMEECCHHAANNIISSMM The text widget has an unlimited undo and redo mechanism (when the |

-uunnddoo widget option is true) which records every insert and delete |

action on a stack. | Boundaries (called "separators") are inserted between edit actions. | The purpose of these separators is to group inserts and deletes into | one compound edit action. When undoing a change everything between two | separators will be undone. The undone changes are then moved to the | redo stack, so that an undone edit can be redone again. The redo stack | is cleared whenever new edit actions are recorded on the undo stack. |

The undo and redo stacks can be cleared to keep their depth under con- |

trol. |

Separators are inserted automatically when the -aauuttoosseeppaarraattoorrss widget |

option is true. You can insert separators programatically as well. If | a separator is already present at the top of the undo stack no other | will be inserted. That means that two separators on the undo stack are | always separated by at least one insert or delete action. | The undo mechanism is also linked to the modified flag. This means | that undoing or redoing changes can take a modified text widget back to | the unmodified state or vice versa. The modified flag will be set | automatically to the appropriate state. This automatic coupling does | not work when the modified flag has been set by the user, until the | flag has been reset again. | See below for the eeddiitt widget command that controls the undo mechanism. WWIIDDGGEETT CCOOMMMMAANNDD The tteexxtt command creates a new Tcl command whose name is the same as the path name of the text's window. This command may be used to invoke various operations on the widget. It has the following general form: pathName option ?arg arg ...?

PathName is the name of the command, which is the same as the text wid-

get's path name. Option and the args determine the exact behavior of the command. The following commands are possible for text widgets: pathName bbbbooxx index Returns a list of four elements describing the screen area of the character given by index. The first two elements of the

list give the x and y coordinates of the upper-left corner of

the area occupied by the character, and the last two elements give the width and height of the area. If the character is only partially visible on the screen, then the return value reflects just the visible part. If the character is not visible on the screen then the return value is an empty list. pathName ccggeett option Returns the current value of the configuration option given by option. Option may have any of the values accepted by the tteexxtt command. pathName ccoommppaarree index1 op index2 Compares the indices given by index1 and index2 according to the

relational operator given by op, and returns 1 if the relation-

ship is satisfied and 0 if it isn't. Op must be one of the operators <, <=, ==, >=, >, or !=. If op is == then 1 is returned if the two indices refer to the same character, if op is < then 1 is returned if index1 refers to an earlier character in the text than index2, and so on. pathName ccoonnffiigguurree ?option? ?value option value ...? Query or modify the configuration options of the widget. If no

option is specified, returns a list describing all of the avail-

able options for pathName (see TTkkCCoonnffiigguurreeIInnffoo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is specified). If one or

more option-value pairs are specified, then the command modifies

the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option may have any of the values accepted by the tteexxtt command. pathName ddeebbuugg ?boolean? If boolean is specified, then it must have one of the true or false values accepted by TclGetBoolean. If the value is a true

one then internal consistency checks will be turned on in the B-

tree code associated with text widgets. If boolean has a false value then the debugging checks will be turned off. In either case the command returns an empty string. If boolean is not specified then the command returns oonn or ooffff to indicate whether or not debugging is turned on. There is a single debugging switch shared by all text widgets: turning debugging on or off in any widget turns it on or off for all widgets. For widgets with large amounts of text, the consistency checks may cause a

noticeable slow-down.

When debugging is turned on, the drawing routines of the text widget | set the global variables ttkktteexxttRReeddrraaww and ttkktteexxttRReellaayyoouutt to the lists | of indices that are redrawn. The values of these variables are tested | by Tk's test suite. pathName ddeelleettee index1 ?index2 ...? Delete a range of characters from the text. If both index1 and index2 are specified, then delete all the characters starting with the one given by index1 and stopping just before index2 (i.e. the character at index2 is not deleted). If index2 doesn't specify a position later in the text than index1 then no

characters are deleted. If index2 isn't specified then the sin-

gle character at index1 is deleted. It is not allowable to delete characters in a way that would leave the text without a newline as the last character. The command returns an empty string. If more indices are given, multiple ranges of text will | be deleted. All indices are first checked for validity before | any deletions are made. They are sorted and the text is removed | from the last range to the first range to deleted text does not |

cause a undesired index shifting side-effects. If multiple |

ranges with the same start index are given, then the longest | range is used. If overlapping ranges are given, then they will | be merged into spans that do not cause deletion of text outside | the given ranges due to text shifted during deletion. pathName ddlliinneeiinnffoo index Returns a list with five elements describing the area occupied by the display line containing index. The first two elements of

the list give the x and y coordinates of the upper-left corner

of the area occupied by the line, the third and fourth elements give the width and height of the area, and the fifth element gives the position of the baseline for the line, measured down from the top of the area. All of this information is measured in pixels. If the current wrap mode is nnoonnee and the line extends beyond the boundaries of the window, the area returned reflects the entire area of the line, including the portions that are out of the window. If the line is shorter than the full width of the window then the area returned reflects just the portion of the line that is occupied by characters and embedded windows. If the display line containing index is not visible on the screen then the return value is an empty list. pathName dduummpp ?switches? index1 ?index2? Return the contents of the text widget from index1 up to, but not including index2, including the text and information about marks, tags, and embedded windows. If index2 is not specified, then it defaults to one character past index1. The information is returned in the following format: key1 value1 index1 key2 value2 index2 ...

The possible key values are tteexxtt, mmaarrkk, ttaaggoonn, ttaaggooffff, and wwiinn-

ddooww. The corresponding value is the text, mark name, tag name, or window name. The index information is the index of the start of the text, the mark, the tag transition, or the window. One or more of the following switches (or abbreviations thereof) may be specified to control the dump:

-aallll Return information about all elements: text, marks, tags,

images and windows. This is the default.

-ccoommmmaanndd command

Instead of returning the information as the result of the dump operation, invoke the command on each element of the text widget within the range. The command has three arguments appended to it before it is evaluated: the key, value, and index.

-iimmaaggee Include information about images in the dump results.

-mmaarrkk Include information about marks in the dump results.

-ttaagg Include information about tag transitions in the dump

results. Tag information is returned as ttaaggoonn and ttaaggooffff elements that indicate the begin and end of each range of each tag, respectively.

-tteexxtt Include information about text in the dump results. The

value is the text up to the next element or the end of range indicated by index2. A text element does not span

newlines. A multi-line block of text that contains no

marks or tag transitions will still be dumped as a set of text seqments that each end with a newline. The newline is part of the value.

-wwiinnddooww

Include information about embedded windows in the dump results. The value of a window is its Tk pathname, unless the window has not been created yet. (It must have a create script.) In this case an empty string is returned, and you must query the window by its index position to get more information. pathName eeddiitt option ?arg arg ...? This command controls the undo mechanism and the modified flag. | The exact behavior of the command depends on the option argument |

that follows the eeddiitt argument. The following forms of the com- |

When the -uunnddoo option is true, reapplies the last undone |

edits provided no other edits were done since then. Gen- |

erates an error when the redo stack is empty. Does noth- |

ing when the -uunnddoo option is false. |

pathName eeddiitt | rreesseett | | Clears the undo and redo stacks. |

pathName eeddiitt sseeppaarraa- |

ttoorr | | Inserts a separator (boundary) on the undo stack. Does |

nothing when the -uunnddoo option is false. |

pathName eeddiitt | uunnddoo | |

Undoes the last edit action when the -uunnddoo option is |

true. An edit action is defined as all the insert and | delete commands that are recorded on the undo stack in | between two separators. Generates an error when the undo |

stack is empty. Does nothing when the -uunnddoo option is |

false. | pathName ggeett index1 ?index2 ...? Return a range of characters from the text. The return value will be all the characters in the text starting with the one whose index is index1 and ending just before the one whose index is index2 (the character at index2 will not be returned). If index2 is omitted then the single character at index1 is returned. If there are no characters in the specified range (e.g. index1 is past the end of the file or index2 is less than or equal to index1) then an empty string is returned. If the specified range contains embedded windows, no information about them is included in the returned string. If multiple index | pairs are given, multiple ranges of text will be returned in a | list. Invalid ranges will not be represented with empty strings | in the list. The ranges are returned in the order passed to | ggeett. pathName iimmaaggee option ?arg arg ...?

This command is used to manipulate embedded images. The behav-

ior of the command depends on the option argument that follows

the ttaagg argument. The following forms of the command are cur-

rently supported: pathName iimmaaggee ccggeett index option

Returns the value of a configuration option for an embed-

ded image. Index identifies the embedded image, and option specifies a particular configuration option, which must be one of the ones listed in the section EMBEDDED IMAGES. pathName iimmaaggee ccoonnffiigguurree index ?option value ...? Query or modify the configuration options for an embedded image. If no option is specified, returns a list describing all of the available options for the embedded image at index (see TTkkCCoonnffiigguurreeIInnffoo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one

named option (this list will be identical to the corre-

sponding sublist of the value returned if no option is

specified). If one or more option-value pairs are speci-

fied, then the command modifies the given option(s) to have the given value(s); in this case the command

returns an empty string. See EMBEDDED IMAGES for infor-

mation on the options that are supported. pathName iimmaaggee ccrreeaattee index ?option value ...? This command creates a new image annotation, which will appear in the text at the position given by index. Any

number of option-value pairs may be specified to config-

ure the annotation. Returns a unique identifier that may be used as an index to refer to this image. See EMBEDDED IMAGES for information on the options that are supported, and a description of the identifier returned. pathName iimmaaggee nnaammeess Returns a list whose elements are the names of all image instances currently embedded in window. pathName iinnddeexx index Returns the position corresponding to index in the form

line.char where line is the line number and char is the charac-

ter number. Index may have any of the forms described under INDICES above. pathName iinnsseerrtt index chars ?tagList chars tagList ...? Inserts all of the chars arguments just before the character at index. If index refers to the end of the text (the character after the last newline) then the new text is inserted just before the last newline instead. If there is a single chars argument and no tagList, then the new text will receive any tags that are present on both the character before and the character after the insertion point; if a tag is present on only one of these characters then it will not be applied to the new text. If tagList is specified then it consists of a list of tag names; the new characters will receive all of the tags in this list and no others, regardless of the tags present around the insertion

point. If multiple chars-tagList argument pairs are present,

they produce the same effect as if a separate iinnsseerrtt widget com-

mand had been issued for each pair, in order. The last tagList argument may be omitted. pathName mmaarrkk option ?arg arg ...? This command is used to manipulate marks. The exact behavior of the command depends on the option argument that follows the mmaarrkk

argument. The following forms of the command are currently sup-

ported: pathName mmaarrkk ggrraavviittyy markName ?direction? If direction is not specified, returns lleefftt or rriigghhtt to indicate which of its adjacent characters markName is attached to. If direction is specified, it must be lleefftt or rriigghhtt; the gravity of markName is set to the given value. pathName mmaarrkk nnaammeess Returns a list whose elements are the names of all the marks that are currently set. pathName mmaarrkk nneexxtt index Returns the name of the next mark at or after index. If index is specified in numerical form, then the search for the next mark begins at that index. If index is the name

of a mark, then the search for the next mark begins imme-

diately after that mark. This can still return a mark at the same position if there are multiple marks at the same index. These semantics mean that the mmaarrkk nneexxtt operation

can be used to step through all the marks in a text wid-

get in the same order as the mark information returned by

the dduummpp operation. If a mark has been set to the spe-

cial eenndd index, then it appears to be after eenndd with respect to the mmaarrkk nneexxtt operation. An empty string is returned if there are no marks after index. pathName mmaarrkk pprreevviioouuss index Returns the name of the mark at or before index. If index is specified in numerical form, then the search for the previous mark begins with the character just before that index. If index is the name of a mark, then the search for the next mark begins immediately before that mark. This can still return a mark at the same position if there are multiple marks at the same index. These semantics mean that the mmaarrkk pprreevviioouuss operation can be used to step through all the marks in a text widget in the reverse order as the mark information returned by the dduummpp operation. An empty string is returned if there are no marks before index. pathName mmaarrkk sseett markName index Sets the mark named markName to a position just before the character at index. If markName already exists, it is moved from its old position; if it doesn't exist, a new mark is created. This command returns an empty string. pathName mmaarrkk uunnsseett markName ?markName markName ...? Remove the mark corresponding to each of the markName arguments. The removed marks will not be usable in indices and will not be returned by future calls to ``pathName mmaarrkk nnaammeess''. This command returns an empty string. pathName ssccaann option args This command is used to implement scanning on texts. It has two forms, depending on option: pathName ssccaann mmaarrkk x y Records x and y and the current view in the text window, for use in conjunction with later ssccaann ddrraaggttoo commands. Typically this command is associated with a mouse button press in the widget. It returns an empty string. pathName ssccaann ddrraaggttoo x y This command computes the difference between its x and y arguments and the x and y arguments to the last ssccaann mmaarrkk command for the widget. It then adjusts the view by 10 times the difference in coordinates. This command is

typically associated with mouse motion events in the wid-

get, to produce the effect of dragging the text at high speed through the window. The return value is an empty string. pathName sseeaarrcchh ?switches? pattern index ?stopIndex? Searches the text in pathName starting at index for a range of characters that matches pattern. If a match is found, the index

of the first character in the match is returned as result; oth-

erwise an empty string is returned. One or more of the follow-

ing switches (or abbreviations thereof) may be specified to con-

trol the search:

-ffoorrwwaarrddss

The search will proceed forward through the text, finding

the first matching range starting at or after the posi-

tion given by index. This is the default.

-bbaacckkwwaarrddss

The search will proceed backward through the text, find-

ing the matching range closest to index whose first char-

acter is before index.

-eexxaacctt Use exact matching: the characters in the matching range

must be identical to those in pattern. This is the default.

-rreeggeexxpp

Treat pattern as a regular expression and match it against the text using the rules for regular expressions (see the rreeggeexxpp command for details).

-nnooccaassee

Ignore case differences between the pattern and the text.

-ccoouunntt varName

The argument following -ccoouunntt gives the name of a vari-

able; if a match is found, the number of index positions between beginning and end of the matching range will be stored in the variable. If there are no embedded images or windows in the matching range, this is equivalent to the number of characters matched. In either case, the

range matchIdx to matchIdx + $count chars will return the

entire matched text.

-eelliiddee Find elidden (hidden) text as well. By default only dis-

played text is searched.

-- This switch has no effect except to terminate the list of

switches: the next argument will be treated as pattern

even if it starts with -.

The matching range must be entirely within a single line of text. For regular expression matching the newlines are removed

from the ends of the lines before matching: use the $$ feature

in regular expressions to match the end of a line. For exact matching the newlines are retained. If stopIndex is specified, the search stops at that index: for forward searches, no match at or after stopIndex will be considered; for backward searches, no match earlier in the text than stopIndex will be considered. If stopIndex is omitted, the entire text will be searched: when the beginning or end of the text is reached, the search continues at the other end until the starting location is

reached again; if stopIndex is specified, no wrap-around will

occur. pathName sseeee index Adjusts the view in the window so that the character given by index is completely visible. If index is already visible then the command does nothing. If index is a short distance out of view, the command adjusts the view just enough to make index visible at the edge of the window. If index is far out of view, then the command centers index in the window. pathName ttaagg option ?arg arg ...? This command is used to manipulate tags. The exact behavior of the command depends on the option argument that follows the ttaagg

argument. The following forms of the command are currently sup-

ported: pathName ttaagg aadddd tagName index1 ?index2 index1 index2 ...? Associate the tag tagName with all of the characters starting with index1 and ending just before index2 (the character at index2 isn't tagged). A single command may

contain any number of index1-index2 pairs. If the last

index2 is omitted then the single character at index1 is tagged. If there are no characters in the specified range (e.g. index1 is past the end of the file or index2 is less than or equal to index1) then the command has no effect. pathName ttaagg bbiinndd tagName ?sequence? ?script?

This command associates script with the tag given by tag-

Name. Whenever the event sequence given by sequence occurs for a character that has been tagged with tagName,

the script will be invoked. This widget command is simi-

lar to the bbiinndd command except that it operates on char-

acters in a text rather than entire widgets. See the bbiinndd manual entry for complete details on the syntax of sequence and the substitutions performed on script before invoking it. If all arguments are specified then a new binding is created, replacing any existing binding for the same sequence and tagName (if the first character of script is ``+'' then script augments an existing binding rather than replacing it). In this case the return value

is an empty string. If script is omitted then the com-

mand returns the script associated with tagName and sequence (an error occurs if there is no such binding). If both script and sequence are omitted then the command returns a list of all the sequences for which bindings have been defined for tagName. The only events for which bindings may be specified are | those related to the mouse and keyboard (such as EEnntteerr, | LLeeaavvee, BBuuttttoonnPPrreessss, MMoottiioonn, and KKeeyyPPrreessss) or virtual | events. Event bindings for a text widget use the ccuurrrreenntt |

mark described under MARKS above. An EEnntteerr event trig- |

gers for a tag when the tag first becomes present on the | current character, and a LLeeaavvee event triggers for a tag | when it ceases to be present on the current character. |

EEnntteerr and LLeeaavvee events can happen either because the ccuurr- |

rreenntt mark moved or because the character at that position | changed. Note that these events are different than EEnntteerr | and LLeeaavvee events for windows. Mouse and keyboard events | are directed to the current character. If a virtual | event is used in a binding, that binding can trigger only |

if the virtual event is defined by an underlying mouse- |

related or keyboard-related event.

It is possible for the current character to have multiple

tags, and for each of them to have a binding for a par-

ticular event sequence. When this occurs, one binding is

invoked for each tag, in order from lowest-priority to

highest priority. If there are multiple matching bind-

ings for a single tag, then the most specific binding is chosen (see the manual entry for the bbiinndd command for details). ccoonnttiinnuuee and bbrreeaakk commands within binding scripts are processed in the same way as for bindings created with the bbiinndd command. If bindings are created for the widget as a whole using the bbiinndd command, then those bindings will supplement the tag bindings. The tag bindings will be invoked first, followed by bindings for the window as a whole. pathName ttaagg ccggeett tagName option This command returns the current value of the option named option associated with the tag given by tagName. Option may have any of the values accepted by the ttaagg ccoonnffiigguurree widget command. pathName ttaagg ccoonnffiigguurree tagName ?option? ?value? ?option value ...? This command is similar to the ccoonnffiigguurree widget command except that it modifies options associated with the tag given by tagName instead of modifying options for the

overall text widget. If no option is specified, the com-

mand returns a list describing all of the available options for tagName (see TTkkCCoonnffiigguurreeIInnffoo for information on the format of this list). If option is specified with no value, then the command returns a list describing the

one named option (this list will be identical to the cor-

responding sublist of the value returned if no option is

specified). If one or more option-value pairs are speci-

fied, then the command modifies the given option(s) to

have the given value(s) in tagName; in this case the com-

mand returns an empty string. See TAGS above for details on the options available for tags. pathName ttaagg ddeelleettee tagName ?tagName ...?

Deletes all tag information for each of the tagName argu-

ments. The command removes the tags from all characters

in the file and also deletes any other information asso-

ciated with the tags, such as bindings and display infor-

mation. The command returns an empty string. pathName ttaagg lloowweerr tagName ?belowThis? Changes the priority of tag tagName so that it is just lower in priority than the tag whose name is belowThis. If belowThis is omitted, then tagName's priority is changed to make it lowest priority of all tags. pathName ttaagg nnaammeess ?index? Returns a list whose elements are the names of all the tags that are active at the character position given by index. If index is omitted, then the return value will describe all of the tags that exist for the text (this includes all tags that have been named in a ``pathName ttaagg'' widget command but haven't been deleted by a

``pathName ttaagg ddeelleettee'' widget command, even if no char-

acters are currently marked with the tag). The list will

be sorted in order from lowest priority to highest prior-

ity. pathName ttaagg nneexxttrraannggee tagName index1 ?index2? This command searches the text for a range of characters tagged with tagName where the first character of the range is no earlier than the character at index1 and no later than the character just before index2 (a range starting at index2 will not be considered). If several

matching ranges exist, the first one is chosen. The com-

mand's return value is a list containing two elements, which are the index of the first character of the range and the index of the character just after the last one in the range. If no matching range is found then the return value is an empty string. If index2 is not given then it defaults to the end of the text. pathName ttaagg pprreevvrraannggee tagName index1 ?index2? This command searches the text for a range of characters tagged with tagName where the first character of the range is before the character at index1 and no earlier than the character at index2 (a range starting at index2 will be considered). If several matching ranges exist, the one closest to index1 is chosen. The command's return value is a list containing two elements, which are the index of the first character of the range and the index of the character just after the last one in the range. If no matching range is found then the return value is an empty string. If index2 is not given then it defaults to the beginning of the text. pathName ttaagg rraaiissee tagName ?aboveThis? Changes the priority of tag tagName so that it is just higher in priority than the tag whose name is aboveThis. If aboveThis is omitted, then tagName's priority is changed to make it highest priority of all tags. pathName ttaagg rraannggeess tagName Returns a list describing all of the ranges of text that have been tagged with tagName. The first two elements of the list describe the first tagged range in the text, the next two elements describe the second range, and so on. The first element of each pair contains the index of the first character of the range, and the second element of the pair contains the index of the character just after the last one in the range. If there are no characters tagged with tag then an empty string is returned. pathName ttaagg rreemmoovvee tagName index1 ?index2 index1 index2 ...?

Remove the tag tagName from all of the characters start-

ing at index1 and ending just before index2 (the charac-

ter at index2 isn't affected). A single command may con-

tain any number of index1-index2 pairs. If the last

index2 is omitted then the single character at index1 is tagged. If there are no characters in the specified range (e.g. index1 is past the end of the file or index2 is less than or equal to index1) then the command has no effect. This command returns an empty string. pathName wwiinnddooww option ?arg arg ...?

This command is used to manipulate embedded windows. The behav-

ior of the command depends on the option argument that follows

the ttaagg argument. The following forms of the command are cur-

rently supported: pathName wwiinnddooww ccggeett index option

Returns the value of a configuration option for an embed-

ded window. Index identifies the embedded window, and option specifies a particular configuration option, which must be one of the ones listed in the section EMBEDDED WINDOWS. pathName wwiinnddooww ccoonnffiigguurree index ?option value ...? Query or modify the configuration options for an embedded window. If no option is specified, returns a list describing all of the available options for the embedded window at index (see TTkkCCoonnffiigguurreeIInnffoo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one

named option (this list will be identical to the corre-

sponding sublist of the value returned if no option is

specified). If one or more option-value pairs are speci-

fied, then the command modifies the given option(s) to have the given value(s); in this case the command

returns an empty string. See EMBEDDED WINDOWS for infor-

mation on the options that are supported. pathName wwiinnddooww ccrreeaattee index ?option value ...? This command creates a new window annotation, which will appear in the text at the position given by index. Any

number of option-value pairs may be specified to config-

ure the annotation. See EMBEDDED WINDOWS for information on the options that are supported. Returns an empty string. pathName wwiinnddooww nnaammeess

Returns a list whose elements are the names of all win-

dows currently embedded in window. pathName xxvviieeww option args This command is used to query and change the horizontal position

of the text in the widget's window. It can take any of the fol-

lowing forms: pathName xxvviieeww Returns a list containing two elements. Each element is a real fraction between 0 and 1; together they describe the portion of the document's horizontal span that is visible in the window. For example, if the first element

is .2 and the second element is .6, 20% of the text is

off-screen to the left, the middle 40% is visible in the

window, and 40% of the text is off-screen to the right.

The fractions refer only to the lines that are actually visible in the window: if the lines in the window are all very short, so that they are entirely visible, the returned fractions will be 0 and 1, even if there are

other lines in the text that are much wider than the win-

dow. These are the same values passed to scrollbars via

the -xxssccrroollllccoommmmaanndd option.

pathName xxvviieeww mmoovveettoo fraction Adjusts the view in the window so that fraction of the

horizontal span of the text is off-screen to the left.

Fraction is a fraction between 0 and 1. pathName xxvviieeww ssccrroollll number what This command shifts the view in the window left or right according to number and what. Number must be an integer. What must be either uunniittss or ppaaggeess or an abbreviation of one of these. If what is uunniittss, the view adjusts left or

right by number average-width characters on the display;

if it is ppaaggeess then the view adjusts by number screen-

fuls. If number is negative then characters farther to

the left become visible; if it is positive then charac-

ters farther to the right become visible. pathName yyvviieeww ?args? This command is used to query and change the vertical position

of the text in the widget's window. It can take any of the fol-

lowing forms: pathName yyvviieeww Returns a list containing two elements, both of which are real fractions between 0 and 1. The first element gives the position of the first character in the top line in the window, relative to the text as a whole (0.5 means it is halfway through the text, for example). The second element gives the position of the character just after the last one in the bottom line of the window, relative to the text as a whole. These are the same values passed

to scrollbars via the -yyssccrroollllccoommmmaanndd option.

pathName yyvviieeww mmoovveettoo fraction Adjusts the view in the window so that the character given by fraction appears on the top line of the window. Fraction is a fraction between 0 and 1; 0 indicates the first character in the text, 0.33 indicates the character

one-third the way through the text, and so on.

pathName yyvviieeww ssccrroollll number what This command adjust the view in the window up or down according to number and what. Number must be an integer. What must be either uunniittss or ppaaggeess. If what is uunniittss,

the view adjusts up or down by number lines on the dis-

play; if it is ppaaggeess then the view adjusts by number screenfuls. If number is negative then earlier positions in the text become visible; if it is positive then later positions in the text become visible.

pathName yyvviieeww ?-ppiicckkppllaaccee? index

Changes the view in the widget's window to make index

visible. If the -ppiicckkppllaaccee option isn't specified then

index will appear at the top of the window. If -ppiicckk-

ppllaaccee is specified then the widget chooses where index appears in the window:

[1] If index is already visible somewhere in the win-

dow then the command does nothing.

[2] If index is only a few lines off-screen above the

window then it will be positioned at the top of the window.

[3] If index is only a few lines off-screen below the

window then it will be positioned at the bottom of the window. [4] Otherwise, index will be centered in the window.

The -ppiicckkppllaaccee option has been obsoleted by the sseeee wid-

get command (sseeee handles both x- and y-motion to make a

location visible, whereas -ppiicckkppllaaccee only handles motion

in y). pathName yyvviieeww number This command makes the first character on the line after the one given by number visible at the top of the window. Number must be an integer. This command used to be used for scrolling, but now it is obsolete. BBIINNDDIINNGGSS Tk automatically creates class bindings for texts that give them the following default behavior. In the descriptions below, ``word'' is dependent on the value of the ttccllwwoorrddcchhaarrss variable. See tclvars(n). [1] Clicking mouse button 1 positions the insertion cursor just before the character underneath the mouse cursor, sets the input focus to this widget, and clears any selection in the widget. Dragging with mouse button 1 strokes out a selection between the insertion cursor and the character under the mouse.

[2] Double-clicking with mouse button 1 selects the word under the

mouse and positions the insertion cursor at the end of the word.

Dragging after a double click will stroke out a selection con-

sisting of whole words.

[3] Triple-clicking with mouse button 1 selects the line under the

mouse and positions the insertion cursor at the end of the line.

Dragging after a triple click will stroke out a selection con-

sisting of whole lines. [4] The ends of the selection can be adjusted by dragging with mouse button 1 while the Shift key is down; this will adjust the end

of the selection that was nearest to the mouse cursor when but-

ton 1 was pressed. If the button is double-clicked before drag-

ging then the selection will be adjusted in units of whole

words; if it is triple-clicked then the selection will be

adjusted in units of whole lines.

[5] Clicking mouse button 1 with the Control key down will reposi-

tion the insertion cursor without affecting the selection. [6] If any normal printing characters are typed, they are inserted at the point of the insertion cursor. [7] The view in the widget can be adjusted by dragging with mouse button 2. If mouse button 2 is clicked without moving the mouse, the selection is copied into the text at the position of the mouse cursor. The Insert key also inserts the selection, but at the position of the insertion cursor. [8] If the mouse is dragged out of the widget while button 1 is pressed, the entry will automatically scroll to make more text

visible (if there is more text off-screen on the side where the

mouse left the window). [9] The Left and Right keys move the insertion cursor one character to the left or right; they also clear any selection in the text. If Left or Right is typed with the Shift key down, then the insertion cursor moves and the selection is extended to

include the new character. Control-Left and Control-Right move

the insertion cursor by words, and Control-Shift-Left and Con-

trol-Shift-Right move the insertion cursor by words and also

extend the selection. Control-b and Control-f behave the same

as Left and Right, respectively. Meta-b and Meta-f behave the

same as Control-Left and Control-Right, respectively.

[10] The Up and Down keys move the insertion cursor one line up or down and clear any selection in the text. If Up or Right is typed with the Shift key down, then the insertion cursor moves and the selection is extended to include the new character.

Control-Up and Control-Down move the insertion cursor by para-

graphs (groups of lines separated by blank lines), and Control-

Shift-Up and Control-Shift-Down move the insertion cursor by

paragraphs and also extend the selection. Control-p and Con-

trol-n behave the same as Up and Down, respectively.

[11] The Next and Prior keys move the insertion cursor forward or backwards by one screenful and clear any selection in the text. If the Shift key is held down while Next or Prior is typed, then

the selection is extended to include the new character. Con-

trol-v moves the view down one screenful without moving the

insertion cursor or adjusting the selection.

[12] Control-Next and Control-Prior scroll the view right or left by

one page without moving the insertion cursor or affecting the selection.

[13] Home and Control-a move the insertion cursor to the beginning of

its line and clear any selection in the widget. Shift-Home

moves the insertion cursor to the beginning of the line and also extends the selection to that point.

[14] End and Control-e move the insertion cursor to the end of the

line and clear any selection in the widget. Shift-End moves the

cursor to the end of the line and extends the selection to that point.

[15] Control-Home and Meta-< move the insertion cursor to the begin-

ning of the text and clear any selection in the widget. Con-

trol-Shift-Home moves the insertion cursor to the beginning of

the text and also extends the selection to that point.

[16] Control-End and Meta-> move the insertion cursor to the end of

the text and clear any selection in the widget. Control-Shift-

End moves the cursor to the end of the text and extends the selection to that point.

[17] The Select key and Control-Space set the selection anchor to the

position of the insertion cursor. They don't affect the current

selection. Shift-Select and Control-Shift-Space adjust the

selection to the current position of the insertion cursor, selecting from the anchor to the insertion cursor if there was not any selection previously.

[18] Control-/ selects the entire contents of the widget.

[19] Control-\ clears any selection in the widget.

[20] The F16 key (labelled Copy on many Sun workstations) or Meta-w

copies the selection in the widget to the clipboard, if there is a selection. This action is carried out by the command | ttkktteexxttCCooppyy.

[21] The F20 key (labelled Cut on many Sun workstations) or Control-w

copies the selection in the widget to the clipboard and deletes the selection. This action is carried out by the command | ttkktteexxttCCuutt. If there is no selection in the widget then these keys have no effect.

[22] The F18 key (labelled Paste on many Sun workstations) or Con-

trol-y inserts the contents of the clipboard at the position of

the insertion cursor. This action is carried out by the command | ttkktteexxttPPaassttee. [23] The Delete key deletes the selection, if there is one in the widget. If there is no selection, it deletes the character to the right of the insertion cursor.

[24] Backspace and Control-h delete the selection, if there is one in

the widget. If there is no selection, they delete the character to the left of the insertion cursor.

[25] Control-d deletes the character to the right of the insertion

cursor.

[26] Meta-d deletes the word to the right of the insertion cursor.

[27] Control-k deletes from the insertion cursor to the end of its

line; if the insertion cursor is already at the end of a line,

then Control-k deletes the newline character.

[28] Control-o opens a new line by inserting a newline character in

front of the insertion cursor without moving the insertion cur-

sor.

[29] Meta-backspace and Meta-Delete delete the word to the left of

the insertion cursor.

[30] Control-x deletes whatever is selected in the text widget.

[31] Control-t reverses the order of the two characters to the right

of the insertion cursor.

[32] Control-z (and Control-underscore on UNIX when ttkkssttrriiccttMMoottiiff is |

true) undoes the last edit action if the -uunnddoo option is true. |

Does nothing otherwise. | [33] ||

Control-Z (or Control-y on Windows) reapplies the last undone |

edit action if the -uunnddoo option is true. Does nothing otherwise.

If the widget is disabled using the -ssttaattee option, then its view can

still be adjusted and text can still be selected, but no insertion cur-

sor will be displayed and no text modifications will take place.

The behavior of texts can be changed by defining new bindings for indi-

vidual widgets or by redefining the class bindings. PPEERRFFOORRMMAANNCCEE IISSSSUUEESS Text widgets should run efficiently under a variety of conditions. The

text widget uses about 2-3 bytes of main memory for each byte of text,

so texts containing a megabyte or more should be practical on most

workstations. Text is represented internally with a modified B-tree

structure that makes operations relatively efficient even with large

texts. Tags are included in the B-tree structure in a way that allows

tags to span large ranges or have many disjoint smaller ranges without loss of efficiency. Marks are also implemented in a way that allows large numbers of marks. In most cases it is fine to have large numbers of unique tags, or a tag that has many distinct ranges. One performance problem can arise if you have hundreds or thousands of different tags that all have the following characteristics: the first and last ranges of each tag are near the beginning and end of the text, respectively, or a single tag range covers most of the text widget. The cost of adding and deleting tags like this is proportional to the number of other tags with the same properties. In contrast, there is no problem with having thousands of distinct tags if their overall ranges are localized and spread uniformly throughout the text. Very long text lines can be expensive, especially if they have many marks and tags within them. The display line with the insert cursor is redrawn each time the cursor blinks, which causes a steady stream of graphics traffic. Set the iinnsseerrttOOffffTTiimmee attribute to 0 avoid this. KKEEYYWWOORRDDSS text, widget, tkvars Tk 8.4 text(n)